{
  "node": {
    "id": "term:jelly-roll",
    "type": "Term",
    "label": "Jelly roll",
    "properties": {
      "id": "jelly-roll",
      "name": "Jelly roll",
      "section": "topic-components",
      "definition": "Electrodes and separators wound together into a spiral. It is the inside of a cylindrical cell and of many prismatic cells; large pouch cells usually use stacked sheets instead.",
      "related": [
        "winding",
        "cylindrical-cell",
        "prismatic-cell",
        "stacking"
      ],
      "lesson": "fundamentals/cell-architecture/#whole-cell",
      "example": {
        "title": "Unroll the geometry",
        "text": "A wound assembly contains long electrode and separator strips; the cylindrical exterior does not make its electrodes solid cylinders."
      },
      "url": "https://lemonergy.com/learn/glossary/jelly-roll/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:599",
      "source": "term:jelly-roll",
      "target": "topic:topic-components",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:600",
      "source": "term:jelly-roll",
      "target": "term:winding",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:601",
      "source": "term:jelly-roll",
      "target": "term:cylindrical-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:602",
      "source": "term:jelly-roll",
      "target": "term:prismatic-cell",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:603",
      "source": "term:jelly-roll",
      "target": "term:stacking",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:604",
      "source": "term:jelly-roll",
      "target": "lesson:fundamentals/cell-architecture/",
      "type": "explainedIn",
      "properties": {
        "sourceFile": "terms.json",
        "url": "https://lemonergy.com/learn/fundamentals/cell-architecture/#whole-cell"
      }
    },
    {
      "id": "edge:605",
      "source": "term:jelly-roll",
      "target": "reference:liu-manufacturing",
      "type": "cites",
      "properties": {
        "sourceFile": "wiki-references.json",
        "scope": "direct technical reference"
      }
    }
  ],
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    {
      "id": "topic:topic-components",
      "type": "Topic",
      "label": "Cell components and electrode materials",
      "properties": {
        "id": "topic-components",
        "name": "Cell components and electrode materials",
        "lede": "What a cell is physically made of — active materials, binders, additives, foils and tabs — and how its electrodes are put together.",
        "context": "Connect each material with its function.",
        "example": "Electrons travel through additive, foil and tab; ions use electrolyte and separator pathways.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-anatomy/",
        "lesson_label": "Open cell anatomy"
      }
    },
    {
      "id": "term:winding",
      "type": "Term",
      "label": "Winding",
      "properties": {
        "id": "winding",
        "name": "Winding",
        "section": "topic-manufacturing",
        "definition": "Rolling the two electrode strips and two separator strips together around a mandrel into a jelly roll. It is fast and well understood, and it produces the round roll of a cylindrical cell or the flattened roll of many prismatic cells.",
        "related": [
          "jelly-roll",
          "stacking",
          "cylindrical-cell",
          "prismatic-cell"
        ],
        "lesson": "fundamentals/cell-production/#assembly",
        "url": "https://lemonergy.com/learn/glossary/winding/",
        "mentions": [
          "electrode",
          "separator"
        ]
      }
    },
    {
      "id": "term:cylindrical-cell",
      "type": "Term",
      "label": "Cylindrical cell",
      "properties": {
        "id": "cylindrical-cell",
        "name": "Cylindrical cell",
        "aka": [
          "18650",
          "21700",
          "4680"
        ],
        "section": "topic-chemistries",
        "definition": "A cell made by winding the electrodes into a jelly roll and sealing it in a round metal can. Sizes are named by their dimensions: a 21700 cell is 21 mm across and 70 mm long.",
        "related": [
          "jelly-roll",
          "can",
          "tabless-design",
          "prismatic-cell",
          "pouch-cell",
          "centre-pin"
        ],
        "lesson": "fundamentals/cell-production/#formats",
        "example": {
          "title": "Shape versus ratings",
          "text": "A cylindrical shape does not supply the model’s capacity, resistance or voltage limits; those belong to the actual cell."
        },
        "url": "https://lemonergy.com/learn/glossary/cylindrical-cell/",
        "mentions": [
          "winding"
        ]
      }
    },
    {
      "id": "term:prismatic-cell",
      "type": "Term",
      "label": "Prismatic cell",
      "properties": {
        "id": "prismatic-cell",
        "name": "Prismatic cell",
        "section": "topic-chemistries",
        "definition": "A cell in a rigid rectangular metal case, holding either a flattened jelly roll or stacked sheets. Large prismatic cells pack tightly into battery packs.",
        "related": [
          "can",
          "jelly-roll",
          "stacking",
          "cylindrical-cell",
          "pouch-cell"
        ],
        "lesson": "fundamentals/cell-production/#formats",
        "example": {
          "title": "Geometry is one constraint",
          "text": "Two rectangular cells can fit similar spaces but use different terminals and electrical ratings."
        },
        "url": "https://lemonergy.com/learn/glossary/prismatic-cell/",
        "mentions": []
      }
    },
    {
      "id": "term:stacking",
      "type": "Term",
      "label": "Stacking",
      "properties": {
        "id": "stacking",
        "name": "Stacking",
        "aka": [
          "Z-folding",
          "lamination"
        ],
        "section": "topic-manufacturing",
        "definition": "Building a cell from individual electrode sheets interleaved with separator, either sheet by sheet or by folding a continuous separator in a zigzag. It uses the volume of a rectangular case better than winding but is slower and more exacting.",
        "related": [
          "winding",
          "pouch-cell",
          "prismatic-cell",
          "notching"
        ],
        "lesson": "fundamentals/cell-production/#assembly",
        "url": "https://lemonergy.com/learn/glossary/stacking/",
        "mentions": [
          "electrode",
          "separator"
        ]
      }
    },
    {
      "id": "lesson:fundamentals/cell-architecture/",
      "type": "Lesson",
      "label": "Lesson 1B · Cell architecture",
      "properties": {
        "url": "https://lemonergy.com/learn/fundamentals/cell-architecture/"
      }
    },
    {
      "id": "reference:liu-manufacturing",
      "type": "Reference",
      "label": "Current and future lithium-ion battery manufacturing",
      "properties": {
        "title": "Current and future lithium-ion battery manufacturing",
        "publisher": "iScience",
        "url": "https://doi.org/10.1016/j.isci.2021.102332",
        "type": "Review article",
        "scope": "Electrode preparation, cell assembly, formation and manufacturing trade-offs.",
        "year": 2021,
        "authors": [
          "Yangtao Liu",
          "Ruihan Zhang",
          "Jun Wang",
          "Yan Wang"
        ],
        "accessed": "2026-10-27"
      }
    }
  ]
}